Sale has ended but you can still get this app.
Download Pulta the OBDII Watchface Pro Now

Official Description

The app can connect your car to your watches (not phones/tablets!) via Bluetooth OBDII adapter directly without needing any phone/tablet.
It's interactive. It's connected. It's configurable.

First, please check your smartwatch by using the free version of the app named Pulta the OBDII Watchface (get it for free on the Google Play).

Do pairing your watch (not a phone!) with the OBDII Bluetooth. After that the app will search devices having "OBD" as the first letters.

Watch part displays:
- Time,
- Moon phase,
- Day of month,
- Day of week,
- Hour of day.

OBDII part currently shows:
- Voltage
- RPM
- Temperature
- Speed
- Boost
- Load

Warning. Please don't drive while working with the app.

Note: The app is intended for smartwatches only and not for phones/tablets.
In rare cases the app may reload the face while changing the colors configuration, hope it's not so big issue.